PIA00324: Volcanic Plains of Io Near Galai Patera
 Target Name:  Io
 Is a satellite of:  Jupiter
 Mission:  Voyager
 Spacecraft:  Voyager 1
 Instrument:  Imaging Science Subsystem 
 Product Size:  1100 x 1292 pixels (w x h)
 Produced By:  U.S. Geological Survey
 Addition Date:  1998-06-04
 Primary Data Set:  Voyager EDRs
 Full-Res TIFF:  PIA00324.tif (2.732 MB)
 Full-Res JPEG:  PIA00324.jpg (150.1 kB)

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Io's volcanic plains are shown in this Voyager 1 image, which spans an area about 1030 km (640 miles) from left to right. North is about the 1:30 position. Numerous volcanic calderas and lava flows are visible here. The brown teardrop-shaped feature at left center is Galai Patera, a 100-km-long (62 mi) lava-flooded caldera (collapsed vent) of a volcano. The composition of Io's volcanic plains and lava flows has not been determined. The prevalent yellow, brown, and orange material may consist dominantly of sulfur with surface frosts of sulfur dioxide or of silicates (such as basalt) encrusted with sulfur and sulfur dioxide condensates. The whitish patches probably are freshly deposited SO2 frost.

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